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(mozilla-projects-nss-reference-fc-digestkey)=

# FC_DigestKey

## Name

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FC_DigestKey - add the digest of a key to a multi-part digest operation.

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## Syntax

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```{code}

CK_RV FC_DigestKey(

  CK_SESSION_HANDLE hSession,

  CK_OBJECT_HANDLE hKey

);

```

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## Parameters

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`hSession`

: [in] session handle.

`hKey`

: [in] handle of the key to be digested.

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## Description

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`FC_DigestKey` continues a multi-part digest operation by digesting the value of a secret key.

The digest for the entire message is returned by a call to

{ref}`mozilla-projects-nss-reference-fc-digestfinal`.

A user must log into the token (to assume the NSS User role) before calling `FC_DigestKey`.

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## Return value

## Examples

## See also

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- {ref}`mozilla-projects-nss-reference-fc-digestinit`,

  {ref}`mozilla-projects-nss-reference-fc-digestfinal`, [NSC_DigestKey](/en-US/NSC_DigestKey)

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